[Extracranial metastasis of primary brain tumours].

This study deals with the visceral metastasis of glioblastomas, ependymomas, oligodendrogliomas and medulloblastomas. Taking a sery fo four cases in the medical literature out of one hundred and fifteen cases published since 1961 and selected according the WEISS criterias, allows to indicate the delay in apparition of these metastasis as well as their elective localisation depending on the anatomopathological type of the original cerebral tumor. It does not give any precise indication to why these visceral metastasis appear. It seems to be very likely that the apparition of these secondary tumors is due to the failure of the shole defence systems of the body, favoured by the relative long survical of these patients and the surgical opening of the brain envelops.